/Engine/Plugins/FX/Niagara/Source/Niagara/Classes/NiagaraSystem.h
struct FNiagaraEmitterExecutionIndex
uint32:  1
bStartNewOverlapGroup
Flag to denote if the batcher should start a new overlap group, i.e. when we have a dependency ensure we don't overlap with the emitter we depend on.
uint32:  31
EmitterIndex
Emitter index to use